Page 263 - Chemistry--atom first

Chapter 4 | Chemical Bonding and Molecular Geometry 253
52. A compound with a molar mass of about 42 g/mol contains 85.7% carbon and 14.3% hydrogen by mass. Write the Lewis structure for a molecule of the compound.
53. Two arrangements of atoms are possible for a compound with a molar mass of about 45 g/mol that contains 52.2% C, 13.1% H, and 34.7% O by mass. Write the Lewis structures for the two molecules.
54. How are single, double, and triple bonds similar? How do they differ? 4.5 Formal Charges and Resonance
55. Write resonance forms that describe the distribution of electrons in each of these molecules or ions.
(a) selenium dioxide, OSeO
(b) nitrate ion,
(c) nitric acid, HNO3 (N is bonded to an OH group and two O atoms)
(d) benzene, C6H6:
(e) the formate ion:
56. Write resonance forms that describe the distribution of electrons in each of these molecules or ions.
(a) sulfur dioxide, SO2
(b) carbonate ion,
(c) hydrogen carbonate ion, (C is bonded to an OH group and two O atoms)
(d) pyridine:
(e) the allyl ion:
57. Write the resonance forms of ozone, O3, the component of the upper atmosphere that protects the Earth from ultraviolet radiation.
58. Sodium nitrite, which has been used to preserve bacon and other meats, is an ionic compound. Write the resonance forms of the nitrite ion,